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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0098cbaf9da404e1e9ecc08b2590163f3c76c32e31a5972e8057d8617df60a' 
  AND token = 'fFk1Mf4rOh84WL6VU2vn+d6ZT6uRojST65MfmX5QoAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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