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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bf7b4c8caec2d9d84701d3355b7bba0d68e675592378078b7d1be5724deb57' 
  AND token = 'HEbg9J7zCFEgdBF0+cm2C0eoepQ6ywbVNxIzFJ0vhsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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