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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0c2ca6b9aee67605ff6f5992917b26fafe3b9c8812b3a535d868062d74f6e3' 
  AND token = '02YoxqASMzo75Uo6JTB+I2G9Q2RbKvToa5rlWtsfugA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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