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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c832a7453a8b582c568703b3c90e25663019b73337410f59369d90b751bc5765' 
  AND token = '9/OB7jQP5/4RN0O5zI4/f5xFMkcJlzZUmSTsZI2hark=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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