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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34ac7f6f275c46b181c024558d4779824284a46f46b86369ae937beb14f6bda' 
  AND token = 'stK3X2/EoqFTECjg4WQfTPMeOD3k1AqoMpqlQ2YNi1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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