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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64bc87a8039771f0eafb2a86374524b7cf0e86225499eff302134469802ec296' 
  AND token = 'BrW99jvYCICyN4Y8O4VOk4y0eVci/libL3tT6IlKwVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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