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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d475d03e08190aa2e6fcb5ef5e331750e50441619613f87165e5bdc64c72f7' 
  AND token = 'hgCXANknjLmqk0vue6x6c2AHz8M7NpHZJLVY6bHa/Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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