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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c760c64bdde2dece737ad52cb67f4532f47d380f9a93ea14b15d122b64d2cb3' 
  AND token = '+VkxBLRt9zZJxz5vmfiZ6+RYex3rZgI83FVbpJvd2v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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