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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e5967001c2f43aeeb6a52cce9e743c594c2792a1b9b3466c786fdbf2f942df' 
  AND token = 'ojSmCIkmRr9IZmlh8FcsGmsXgJPGrAi2JkwUrmGlY5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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