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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12083aa7d6a022eab7a5b853ef3b0608ff3f9e61260403f059515564c2447aee' 
  AND token = 'FPIL5xhLnFpHyzWCLILBJS0ocJTue46PHsF3sSb/8bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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