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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7f128b0ec8c3c08446143b480c1be1a3b865b7d04cc015a95d206def0ec197' 
  AND token = 'mOFol/eSvs45wSU1xN9jDzswH56ajcmIYsQ1A4FoHQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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