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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8f7df1abd5b1f999d2c647b3b4639ca947829bada0feaafe3c665ddd5d5d93' 
  AND token = 'n2IDgwKAkExXfJiqoCtA657syO4nvLx8rkD7JGnGucc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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