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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ba984ac1af3d7da9a82cdbafc6757d32e89bddf2a440c7bdb5d59ab96774a9' 
  AND token = 'Am+PQIwVVHYDDGdktpmba03YqemVOCBbvNKJP1hCIVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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