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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac30f7645e7ad9d655c5754575116bb43dcda98adf7c32e11c40947ce2953fe4' 
  AND token = 'PL7qFoTM4yo4gXlfwU5PERdIO9QbYy1hLehrWNPOoHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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