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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7fede6947a0a3ca60af98c6438ef3ba47ae8227d9b62d2ce2cf0b808077bc4' 
  AND token = '46pJa8tRHpFxuGWkeKEwAXQ4NVk0Ig7+vhcFD2eb87Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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