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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5abca973f12118b3dc0ef4132a12833aba224496b0fe3e59b24fb3a8c367cb3' 
  AND token = 'tXyYS8R/A0pWH92oraeLJ2GVz2SLQSh/9P2U/kjOajY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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