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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26afbd354fb7269450b94c4a63b6600a0a4de3438f9caa0347dd55d736d1e757' 
  AND token = 'uyDgQB1shS4UcvmCPEVR1eBKLkSwqY8QN97Eh87kty8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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