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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871dceb6b0ee37d17bd388caab05608f38e39141246df995c78ccdde2e1e3a99' 
  AND token = 'tzGCYY5dDkmLO28AMBNpDscQd3wr1BDgUPgXMW2OhCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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