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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0985fd8b927c3738743280004acb1a7f036acfe8778e5cb5761833ac90de6339' 
  AND token = 'jx43qYskkk8cJK1DIBvXM6TE0dxF5Q7JQASzWM1ReZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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