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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79e7ce3635592cedf4e61653a12c8ee6a5e0f6c47739d11b1d937b38ee5c093' 
  AND token = '+n/9hcSUlk0m3t0Ia0jVNxm/yRXbY5fkg+hQyYi1hhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}