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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cba870f470bc6dfe6d240b47a875c901ac049c39dedc66c1ebf4c9ad2c807c2' 
  AND token = 'SELnnJyv48cffYmBS8ADj7u3AUcWpgugwpuMJqrr2OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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