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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba9388e134e73cfeb500d1cbd1752a9e6bfd132abb4e14198b900b6731a3a99' 
  AND token = '/8kThWzjTNq2VuLfptipelnPOyRMkqz2D1t/zLiXTPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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