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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042251dce0b3f9291c7332652c02454c663fe96a63ce37704e3273cd26ceda28' 
  AND token = 'Phkg3yHbx5ovrIgE8T3n3y82owN1H8ZxHtxavv14PqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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