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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f95434c5b2429ee3cac0dd9754d9fdb3fb66cb99797ac4b96f3b90ebaf41cd2' 
  AND token = '24PKGGW7OWyvpNjx5wWXE0GXtCSWWGFPcl2x7+GrgVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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