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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02837f1e2806cc825283d2a94c2a04dccc8897d1cda4c09d801ebfc8302827ae' 
  AND token = 'iL8Q6UM0tM5oVanZkeyw8rLeR/FRIA1EfhRqB8Y1qKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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