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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670dcbaf2ac49b59f38290ca0b1a5ab253b13d78e7363302a6db5d1c97ccbb89' 
  AND token = 'eRdZ7ucRLAEXHDELG3yWe+JoLbhuvQh8aJzV4eagqI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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