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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fb01ce47950479a5d1e7623ca2f9a08356680f008af06d5021f965e50dd8f1' 
  AND token = '39In6Z7kK9miDpFMVoSZt6nGU+da7aP3hgJ9ccDk3Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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