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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfc86b5d9651f15b00fd8ebf6d675bd5596608c23e40d24ab29adc464c8739b' 
  AND token = 'axgb0jREOKOeCgPO5MA6U6i7LUWnjKzpMpLKxd3OeAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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