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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fc45cfdd4952ca8858d9743df92ec49910aab0eeecdf2a19d26e4fc24f56b6' 
  AND token = 'EM09dx5jguswcbfHwiekNzPBEvq6PcqMqQkemlfFwLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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