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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bb84c1d761da2b8e2947136882b36e22411f851cd5bf55399415454c5b00ed' 
  AND token = '2qPzVEU/+ku68hyiyV+rKaIEm/GL3nHy7XldXb+LPXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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