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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba8f0226b91b01f6c01a8668247e57b2675e61ac264c179baa812da20ed3e4d' 
  AND token = '5h2FNpesLG9ppuAEZe4P1PqPUy/B3nPm5eWKn5JLXdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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