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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d1118c04dc74ae403887223a89f03616218b9d979aa613cb903ffb1f0ad01a' 
  AND token = 'eZuD4yqwltLnz2sxkKLsJUqRNrlIXpZK8HM23t41RAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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