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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ca4fd06a8cd493e58c90017018ddc310c08c5b434c40508862f2ac9209c4b7' 
  AND token = 'upj6yFDgxR6Cwl46WTrocfO7CQ55WBJlVXp7az8igw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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