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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd120eeaf2363552b1f69d019fe489c7640233bdf42307c8a87fc936858469ac2' 
  AND token = 'd8dU/N4Fo8qJ8Vr3wk7jchARYQLyTQzc9z3n/198Xb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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