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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bce1b6705a841ec56ab4e6eab811a4c943b509d427a524d62e076f806021d95' 
  AND token = 'YU6PdplWXgFCArmwEukxIvgHXFHeyYf7BTZr7CA1VAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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