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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2841d9c93c4110b3d477268df4ace45fc81c304c74bf00d3d5532ddfccec42' 
  AND token = '6OSydkSzS2kEzPl8G/J8SrXXbbENV0LUW2c7GxQb7kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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