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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00e848f51667e4d1be892e51553898878f00ff17c86ccebe5cd02af574ad4e1' 
  AND token = 'USzpqWCk6vxLhoz6CpJp/sxvgLZNgOBNVTVeX5uNMv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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