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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9913eb772e158d8c6cf9b9e4e0bd534e0323106ae7166d6de8f74c980ebe4944' 
  AND token = 'I3hE+qKQzYeltI8X85rIoMBAtrXicFRng3FVptc0f2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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