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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f897b947fe41b6f71c8886646a372fc523c052dbff465fb2805e9a5e8af2f87f' 
  AND token = 'lHyzxS7wEyKg8R11ttfp05gFfD49kb2BiOPCnY3t/CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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