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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415854d8d889f98148c1558bbc1da076bdf1389716d33d9dd5ef91061daad572' 
  AND token = '7l86oazDA8nOh4DNgkHrsS2SrecSh50Ju7llIE/djis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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