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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc29b855b4cda46b7a1d9eaae6cff1c693d1ace66977ee5162f1af6ccd85cba2' 
  AND token = '7CN2o8ENQPaIukVkCOqRT5/SNnc3iPtzs++zl61k2uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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