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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f6ecaa746531dbcd623e5758f3cfd2bf71555fd445175337cd5f70764f8e2c' 
  AND token = '1teGHqcNFxp7L5g5r4sSw1dgTOSa5tbod0mTmGwSm+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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