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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ce69d83d34c4ac23e8c49079a3f1acd264784bc0dc2adea0947fd491b895a9' 
  AND token = 'YXADu4+/Ei8ao8G5VVY30O6m5KavulO7H0VQuKfefPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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