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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f2978ca208f1769d28dcb3214f164c5511749cad0a2f114bfe507b3127bec5' 
  AND token = '/+myRTNVkX6D3J/NfWAOeS9DLEuU9nX13TAxGf091kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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