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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e294ac5f5c652f69430d6b87e623382849ae837cb999b999fc9152486f52593b' 
  AND token = 'L6T6OMUm8gqWGxuURM0iqFJ+5owK77Ae4AC8JO6J8gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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