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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c480082c0856f7eb053edd38aa678897c37f98837cbd3f7f34d13d278f99d3' 
  AND token = 'bXak9VQmSVG3EeKNAXxRwjDMWO95IuagwGw8tvZAXlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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