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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e1d825def1f3cdea677947fd34de2f3d37b0bd955f705399c8011112c16712' 
  AND token = '50en+RrEvqJ+Z19F4jgvGqACiaKBeQftXeaMvRdAqbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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