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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d0194a60aeb60cc7ad812a75c0fa890be2e13bfc5b0275e00aace916683aeb' 
  AND token = '3DA0E+yswgV8vdkasUm93pLjqygE2f4GoHwJLMbLLYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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