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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c375b56d6934b3b1ae308a9e1472e902302c7547278583fded6bb1af2a6ec0' 
  AND token = 'SvY14Y9JIh2JCMu2RREpFCVbqfv4PmLzFv9zf2To6hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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