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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf07c472e3fb38cd29d66b7843d7ca8ea6d505fb2e7b94733848a9232484780' 
  AND token = 'ctNtvIfJc+1WWkOISoYDn3fWFqnaQDgmMTZoMbi/KqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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