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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8f35796da0a18f069e28a320bf5b7f4640ceff78b4e62d3b32770ab7d365d5' 
  AND token = 'KQXZtPnRhwfltteBjBapxLuHbbx+rR6x7wK95/f3B3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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