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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7f9dedb735963cb64db996870a7345dad868accc03659d80002a2889d5ae51' 
  AND token = 'lXZ4dL5O9PjxM1DF4KXiTaxKKQfjRSIwHCf6sXI5IGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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