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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da8d986bd0f6afa70d373324cc1e0bdf45e9aaa26686875ac1214f1ad16238d' 
  AND token = 'RZaqz5OyQ3hmmeswFh627Ewv4Sl7kbX3nbQoIBvMzPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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