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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633164bf37bd1c26dc2f6363c80cce2660f9c9d7fcc4a4838cfa0eefa29bd81c' 
  AND token = 'JqOVmDUKuN9sT0IL5JgUkd5plyumqwZKgdJqtc2MisA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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