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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3db8dbb545d12ddb8993b2458129fe66d471cefd07beaf7b402d01ae36db0a' 
  AND token = 'SFoTc0ei84wFMcVLeRNN13jojnTyMeu0FZCx95bO1YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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