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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de61367a365b138bed95a8ea1713bb6250a043bbd78f0f7a9e3bb71c1670089' 
  AND token = 'Dz3l33jck/x2pfmYoAwPTTAk/PkbW4jUrP059okHeFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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