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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1231f0667c4866bc9804005da633cd58fe452c73fe5d4fee3f1c01e234460712' 
  AND token = 'DwC4oeHAf/rwF0asqJjy3u4ceInLJl/xpMUbL3rTaF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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