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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03196905fa130a68ad1a2c95049a3650e8e8c529d3144da3da8dd9f6ea440e7a' 
  AND token = '+jykpm7uW5SJUFh+8ixsSbNIeUZL45yX1IS4+YGh07Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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